Heterogeneous Nucleation-Induced Upward Crystallization for Perovskite Solar Cells

IF 18.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Qi Liu, Zhen Wang*, Zixiang Wang, Xuejing Cao, Kaidi Liu, Zhiyuan Kuang, Pinghui Yang, Xuanxuan Cao, Guangwei He, Chunyang Miao, Jin Chang and Jianpu Wang*, 
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Abstract

Formation of monolithic perovskite grains with low grain boundary defects is crucial for achieving high-performance perovskite solar cells (PSCs). Inclusion of two-dimensional (2D) perovskite seeds at the bottom surface is a facile method to induce an upward-directional crystallization that forms monolithic grains. However, the large organic cations in 2D perovskites can hinder carrier transfer at the bottom interface. Here, we demonstrate that inclusion of multidentate potassium pyrophosphate (PPH) at the perovskite bottom surface can induce formation of monolithic perovskite grains with reduced defects. We find that the PPH modifier can decrease the Gibbs free energy barrier for heterogeneous perovskite nucleation, leading to a faster nucleation at the bottom surface. This faster heterogeneous nucleation facilitates an upward-directional crystal growth of 3D perovskites, leading to significant defects suppression and effective carrier transfer at the bottom surface. Based on this approach, the PSC achieves a power conversion efficiency of 25.3% with improved thermal stability, maintaining 81% of its initial power conversion efficiency at 85 °C for 1100 h.

Abstract Image

钙钛矿太阳能电池的非均相成核诱导向上结晶
形成具有低晶界缺陷的单片钙钛矿颗粒是实现高性能钙钛矿太阳能电池(PSCs)的关键。在底表面包含二维(2D)钙钛矿种子是一种诱导向上定向结晶形成整体颗粒的简便方法。然而,二维钙钛矿中较大的有机阳离子会阻碍底部界面的载流子转移。在这里,我们证明了在钙钛矿底表面包含多齿焦磷酸钾(PPH)可以诱导形成具有减少缺陷的整体钙钛矿颗粒。我们发现,PPH改性剂可以降低非均相钙钛矿成核的吉布斯自由能垒,从而使底表面的成核速度更快。这种更快的非均相成核促进了三维钙钛矿的向上定向晶体生长,导致了明显的缺陷抑制和有效的底表面载流子转移。基于这种方法,PSC实现了25.3%的功率转换效率,提高了热稳定性,在85°C下保持了81%的初始功率转换效率1100小时。
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来源期刊
ACS Energy Letters
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍: ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.
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